diff --git content/common/sandbox_win.cc content/common/sandbox_win.cc
index 3c8150376bbe..5d505838ec1d 100644
--- content/common/sandbox_win.cc
+++ content/common/sandbox_win.cc
@@ -783,8 +783,11 @@ sandbox::ResultCode StartSandboxedProcess(
 #endif
 
   // Post-startup mitigations.
-  mitigations = sandbox::MITIGATION_STRICT_HANDLE_CHECKS |
-                sandbox::MITIGATION_DLL_SEARCH_ORDER;
+  mitigations = sandbox::MITIGATION_DLL_SEARCH_ORDER;
+  if (!browser_command_line.HasSwitch("win-rt-app")) {
+    // Don't enable this mitigation in WinRT apps. See issue #2274.
+    mitigations |= sandbox::MITIGATION_STRICT_HANDLE_CHECKS;
+  }
   if (base::FeatureList::IsEnabled(features::kWinSboxForceMsSigned))
     mitigations |= sandbox::MITIGATION_FORCE_MS_SIGNED_BINS;